Question: who is the significant person of mark zuckerberg?
Paraphrase: who is mark zuckerberg's significant person?
SPARQL (Wikidata):  select distinct ?obj where { wd:Q36215 wdt:P3342 ?obj . ?obj wdt:P31 wd:Q5 } 
Answer: Eduardo Saverin, Dustin Moskovitz, Chris Hughes